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Malware Analysis Reverse Engineering

GuLoader’s Unique Approach to Obfuscation: Understanding Stack Manipulation

For those that often enjoy reverse engineering shellcode, or obfuscated malware in general, you may have come across an interesting “malware” family named GuLoader – malware in quotations as it has in the past been linked to a company selling a software packer named CloudEyE (see: Checkpoint Research), though it does appear most of it’s […]

Malware Analysis Reverse Engineering

Developing YARA Rules Based on Byte Patterns: ROMCOM

YARA is an important tool for any aspiring threat intel analyst or reverse engineer, whether for detecting code reuse among different families, identifying samples utilising a certain technique, or even tracking the development of recently discovered malware.  While using simple string patterns for rules can be an efficient method for quickly building detections, it is […]

Malware Analysis Reverse Engineering

Reversing Golang Developed Ransomware: SNAKE

Introduction Snake Ransomware (or EKANS Ransomware) is a Golang ransomware which in the past has affected several companies such as Enel and Honda.  The MD5 hashing of the analyzed sample is ED3C05BDE9F0EA0F1321355B03AC42D0. This sample in particular is obfuscated with Gobfuscate, an open source obfuscation project available on Github. Let’s start by quickly summarizing the functionality of the […]